Reversible tapping-chuck



W. N. JOHN.

REVERSIBLE TAPPING CHUCK.

APPLICATION FILED IAN. I9, 1920.

1,381, 197, Patented June I4, 192L 2 SHEETS-SHEET I.

W. N. JOHN.

REVERSIBLE TAPPING CHUCK.

APPLxcATloN FILED JAN. 19, 1920.

1931,19?, Pratentedlune 14, 'H2L 2 SHEETS--SHEET 2.

"WELLIAM JOHN, 0F MZ[I.f'\7lTA.UEFE,l WISCOITSEN.

Specification of Letters Patent.

'Patenten aan@ ia.' resi.

Application led January 19, 1920. Serial No. 352,455.l

To all lz/zao/m. t may concern:

Be it known that l, WILLIAM N. J OHN, a citizen of the United States, and resident of Milwaukee, in the county 4of Milwaukee and State of `Wisconsin, have invented certain new and useful Improvements in Reversible Tapping-Chucks; and I do hereby declare that the followingis a' full', clear, and exact description thereof.

My invention relates -to new and useful improvements in reversibleA chuck devices adapted for-association with the drive spindle 'of a drill press er similar mechanism for performing thread cutting and. like operations, my device being more particularly of that type wherein the tool is automatically reversed upon drawing it from the hole.

It is more particularly an object of my invention to provide an exceedingly compact gear arrangement whereby al maximum reduction of speed may be procured in reversing the direction of rotation' of the tool member.

It is further my object to provide a gripping arrangement for the tap or other tool member employed which permits a full float action of the tool to adapt itself to the hole to be tapped or threaded, and wherein the element of wear is reduced to a minimum.

A still further object resides in the provision of an improved arrangement for procuring a positive dischar e of oil or other lubricating fluid against t e tool in its cuttin action.

ith the above and other vantages in view, which the deseription proceeds, my invention resides in the novel features of construction, combination and arrangement of parts, which will be hereinafter more particularly described and defined by the appended claims.

In the accompanying drawings:

Figure 1 is a vertical sectional View through' a reversible chuck structure embodying my invention.

Fig. 2 is a plan view yof the gear casing, with 'the cap portion thereof removed:

Fig. 3 is a transverse sectional view on the line 3 3 of Fig. 1.

Fig. 4 is a transverse sectional view. on the line 4 4 of Fig. 1, and Fig. 5 is a transverse sectional View through the tool gripping members on a plane indicated by the line 5 5 Fig. 1.

objects and adwill be apparent as Referring now more particularly tothe accompanying drawings, l provide a cupshaped gear casing formed of a pair ofmating sections 10 and 11 respectively, said sections being connected at their upper portion. by the depending wall of a cap member 1*? which is threaded thereon, the capv member formingthe top of the casing and carrying a central bearing portion 13 in which lis jurnaled the hub 14 of an internal ear ring' 15 which is of a diameter slightly less than the internal diameter of the casin The shank member 16 is threaded in the hub to engage in the socket of the rotating spindle of the drill press or similar mechanism. The lower ends of the tions-are connected by a ring 17 lthreaded on sleeve extensions 18 thereof, and a bearing sleeve 19 is mounted `in said sleeve exten-- sions and receives a shaft 20 which extends through the casing and is slidable in the hub 14. This shaft 20 carries suitable tool gripping means, as will be later specically described. A gear 21 is loosely mounted on the shaft 20 in the lower portion of the casing and this gear meshes with idler gears 22 carried by the lower portion of stub shafts 23 mounted in inward bearing extensions 24 on the wall of the casing, the upper ends of said shafts 23 carrying gears 25 meshing with the internal gear 15 wherebyto provide a drive connection between the upper member 14 and the loose gear 21. A clutch member 26 is mounted on the shaft 20 between the lloose gear and hub member and is selectively engageable with clutch portions formed on the members.

Thus, when the shaft 2O wardly as will' is shifted in.- occur when a tool carried thereby is pressed against its work, adirect drive will be afforded from.. the hub mem'- ber to the shaft 20and when the shaft member- 20 is shiftedoutwardly, a reverse drive at a greatly increased speed will be procured through the internal gear 15, gears 22 and loose gear 21 to thus procure withdrawal of the tool from the-Work at a rapid speed. The gear casingis held from rotation by an arm 27 carried on a bolt 28 threaded on the side-of the casing, said arm being adapted'to engage the frame of the drill press or other structure with which my device is associated.

A cylindrical tool receiving head 28 is formed on the lower end of the shaft 20 and mating casing secv shank, a set gaged on all` four/sides is provided with a transverse slot there through in which is loosely mounted upper and lower blocks 29 and 30 respectively, the lower blochbeing provided with. a depending portion which extends through the bottom of the head. 'i he upper bloch is provided with a squared recess 3l' for receiving the usual squared upper end of the shankof a tap t or similar tool member, while the lower bloclr 30 is provided with a passage for receivingv the rounded 'portion of the screw 32 being threaded in the bloclr. 30 to bind the shank therein.' The bloclr 30 thus serves' merely to hold the tool member within the-head, while. the rotative driving impulse of the tool member is im'- :parted thereto by the engagement of its squared vupper end. in the correspondingly squared aperture of floating drive is thus adorded for the tap, whereby it may automatically ladjust' itself to properly centered position with respect to the hole to be threaded, `and inasmlich as the squared end ofthe tool member will be enby the recessof the block 2 9, a positive drive is edecte'd lwith aA minimum amount of wear, in contradistinction to those arrangements wherein the drive action. is imparted to the tool member through a screw thread binding engagement. Y f y To insure positive discharge of oil or other coating fluid onto the tool member, Aa casing 34: receiving head, the wall 'of the casing being held spaced from the head by an apertured flange 35 in its lower portion and. by a detachable upper closure member 36 of the casing., A nipple 37 extends from the casing for connectionV with a suitable fluid supply tube 38 andthe bottom of the casing is provided with an aperture slightly larger than the reduced extension of the block 3() whereby cooling fiuid discharged into the casingl `will-be directed downwardly in an annular stream about the workingpplrtion of the tool member, the tool headrotating freely within vthecasing and l-supporting the same,

l have thus provided a comparatively simple andl highly efficienti. reversible tapping chuck which possesses decided advantages of economy, stren hand durability.

While l have shown and described a preferred embodiment of my invention, it will be appreciated that various changes and modifications of structure may be employed to meet di'ering conditions of use and body, a cap member the block 29 whichis. loosely held against rotation by abutment with the sides of the slot of the. head.

scribed, a driven shaft,

is loosely disposed about thework.

.with an opening 1n lhave hereunto set my manie? manufacture, without departing in any mann nerfrom the spirit of my' invention.

What is claimed is:

1. A chu'clr device of the class described comprising a gear casing including a pair of mating sections .forming a cup shaped threaded on the mouth' portions of said sections, bea-ring extensions at the bottoms of said sections, means secur-y ing said extensions together, a bearing sleeve .in said extensions, a tool carrying shaft slidable in said sleeve, an internal gear having its hub portion'journaled in said cap member, means for driving said internal gear, a counter shaft journaled in the casing, a gear loose on said slidable shaft, pinions on thecounter-shaft meshing with said loose gear and the lnternal gear, a clutch member on the slid-able shaft between the gears,.

and coacting clutch portions carried by the AL gears.

. 2. -In a chuck device of the class dea head on said. shaft, means for securing a tool in said shaft head, a casing looseiy disposed about said shaft head and provided with an aperture in its bottom to directduid along the tool4 carried by the head, and a liquid supply means for the casinge l f 8. lln a` chuckdevice of the class described, a driven shaft, a hea'd on said shaft, means for securing a tool a cup shaped casing member adapted to re' ceive said head, a closure for said `casing member, said casing member and closure having rotative bearing engagement,` with the head and said casing being provided its bottom, and a fluid supply tubaextending from said casing.

4. chuck device of the class described, a drive shaft, 'a head portion onY said drive shaft provided with a transverse'slot, a tool member having a rounded shank portion terminating in a squared extremity and insertible in the slot of the headportion, ablock transversely slidable in the slot of the head portion and provided with a squared aper` ture for loosely receiving the squared extremity of the tool shank, a collar loosely disposed in the slot of the head below said block and adapted to receive thetool shank, and means for binding the shank in the collar.

In testimony that'l claim the foregoing I l hand at Milwaukee, in the county of Milwaukee and lStateof Wisconsin. i

WILLIAMN, Jona.

in said shaft head, 

